Armchair



FIG. 1 is a top, right and front side perspective view of an armchair, showing my new design;

FIG. 2 is bottom, right and back side perspective view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a back elevational view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a right side elevational view thereof;

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan view thereof. 

CLAIM The ornamental design for an armchair, as shown and described. 